Very much agreed.
Harder enemies and only your flashlight (switch on and off) to rely on during nighttime would be a very cool addition and it would make for more variety - makes you inherently more cautious, etc. If Bungie could do something with the night time cycles similar to the S.T.A.L.K.E.R. games that would be fantastic! To anyone that's ever played [i]Stalker: Shadow of Chernobyl[/i] or [i]Call or Pripyat[/i], you know what I'm talkin' bout ;)
Only the brave, the foolhardy or the higher level players go out alone into the wilderness at night!